Evaluating the Accuracy of Soft Tissue Prediction in Patients With Mandibular Prognathism After Orthognathic Surgery Using Handheld Scanner Versus Optical Scanner A Prospective Clinical Trial

Aim of study: To evaluate the accuracy of soft tissue prediction in orthognathic surgery using handheld scanners versus optical scanners. Research hypothesis (null hypothesis): there is no difference in prediction accuracy between laser scans and handheld scans. Primary objective: To evaluate The Accuracy of soft tissue prediction in orthognathic surgery using handheld scanner versus laser scanner . Secondary objective: To evaluate scanning time, cost efficiency, and ease of use. patients will be treated from mandibular prognathism using only mandibular set back or bimaxillary surgery After six months postoperatively, 3D facial scans is obtained and exported to software to perform superimposition of the predicted and post operative results to assess the accuracy of soft tissue prediction By measuring the difference in millimeter between prespecified points